Exam 11: The Basic Principles of Heredity

A heterozygous fruit fly with normal wings and a gray body (VvBb) is crossed with homozygous flies with vestigial wings and black bodies (vvbb). Out of 800 total F₁ progeny, 296 are normal gray, 328 are vestigial black, 99 are normal black, and 77 are vestigial gray. What is the best explanation for this result?

A cross of two medium height hybrid plants produces offspring that are dwarf, medium, and tall in a ratio of 1:2:1. This is an example of:

A ____ is best used to demonstrate the linkage of two genes.

What are the possible phenotypes of the children if the mother's genotype is I^Ai for blood type and the father is I^Bi ? (Use the Punnett square to verify your answer.)

What is dosage compensation with respect to the sex chromosomes, and how is this accomplished in humans?

The genotype for a pea plant that is homozygous recessive for both height and pea color would be:

Mendel's principle of independent assortment describes the segregation of paired factors during the formation of gametes. __________________

The sex of most mammals, birds, and insects is determined by:

A test cross is performed to determine phenotype . __________________

The physical appearance of an organism for a given trait is known as:

A lizard with a striped tail and a normal head is crossed with one having a normal tail and a spotted head. All of the F₁ progeny are normal (no stripes or spots). What progeny would be expected to be produced by mating the F₁ progeny with each other, if the genes conferring stripes and spots were on different chromosomes?

If a couple is planning on having three children, what is the probability that only one will be male?

Mendel's principle of segregation states that:

____ are alternative forms of a gene that govern the same feature, such as eye color, and occupy corresponding positions on homologous chromosomes.

A pear plant with the genotype Aa can produce gametes containing:

Mating an individual expressing a dominant phenotype, but whose genotype is unknown, with an individual expressing the corresponding recessive phenotype is an example of a(n):

Dosage compensation is defined as the genetic phenomenon that allows two copies of an X-linked gene present in females to create the equivalent phenotype as in a male with only one copy of an X-linked gene.

All calico cats are female because: